Animal Molecular Breeding 2024, Vol.14, No.3, 217-227 http://animalscipublisher.com/index.php/amb 223 consent, screening, and assessment of donors and recipients, are also critical. These guidelines help ensure that the practices not only advance scientific and breeding goals but also respect the ethical standards of animal welfare and genetic integrity. 8 Case Study 8.1 Case study: successful implementation of embryo transfer in a feline breeding program In a recent feline breeding program, the implementation of embryo transfer (ET) techniques was explored to enhance genetic diversity and improve reproductive outcomes. The program utilized vitrified immature cat oocytes (Figure 2), which were subjected to a stepwise cryoprotectant exposure technique. This method aimed to protect the oocytes against cryoinjury during vitrification, thereby preserving their viability for subsequent in vitro maturation and fertilization (Colombo et al., 2020a). The embryos derived from these oocytes were then transferred into recipient queens, resulting in successful pregnancies. This case study highlights the potential of advanced ET techniques in feline breeding programs, demonstrating their efficacy in achieving successful pregnancies and contributing to the genetic management of valuable or endangered feline species. Figure 2 Representative fluorescence micrographs of vitrified (A,B), fresh (C, negative control), and hydrogen peroxide-treated (D, positive control) domestic cat oocytes (Adopted from Colombo et al. 2020b) Image caption: Bright blue fluorescence (A.1,B.1,C.1,D.1) indicates the nuclear material. Bright red fluorescence (B.2,D.2) in the nuclear area indicates DNA fragmentation by TUNEL assay. Green fluorescence in the ooplasm (A.3,B.3,C.3,D.3) indicates, according to its intensity (Adopted from Colombo et al. 2020b) 8.2 Challenges encountered and solutions implemented During the implementation of the ET program, several challenges were encountered. One significant issue was the reduction in meiotic and developmental competence of vitrified immature cat oocytes compared to non-vitrified controls. To address this, the program experimented with different cryoprotectant agents and exposure techniques.
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